If African farmers can use improved seeds and better practices to grow more crops and get them to market, then millions of families can earn themselves a better living and a better life.

Those who understand the steam engine and the electric telegraph spend their lives in trying to replace them with something better.

I have an irrepressible desire to live till I can be assured that the world is a little better for my having lived in it.

I've always been better moving than I am standing still.

Discontent is the first necessity of progress.

Relentlessness and discontent are the first necessities of progress.